March hare noun
- a hare during its breeding season in March, noted for its wild and excitable behaviour (esp in the phrase mad as a March hare)
Examples from the Web for march hare Historical Examples of march hare
He is mad as a March-hare himself, by all accounts; but everybody likes him.
R. D. Blackmore
The Oracle and the over-production men will totally supplant the March-hare.
William Cobbett